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MathGroup Archive 2005

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Re: Why can't I call Random[NormalDistribution[10.0,0.0]]?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56141] Re: [mg56106] Why can't I call Random[NormalDistribution[10.0,0.0]]?
  • From: DrBob <drbob at bigfoot.com>
  • Date: Sat, 16 Apr 2005 03:53:04 -0400 (EDT)
  • References: <200504150848.EAA11604@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

rand[mu_,sigma_?Positive]:=Random@NormalDistribution[mu,sigma]
rand[mu_, 0 | 0.] := mu
MapThread[rand,{Range@3,Range[0,2]}]

{1, 3.0837, 1.44367}

You'd have

MapThread[rand, {array1, array2}]

Bobby

On Fri, 15 Apr 2005 04:48:13 -0400 (EDT), <barrowes at alum.mit.edu> wrote:

> Why can't I call Random[NormalDistribution[10.0,0.0]]?
>
> I get the error:
> NormalDistribution::posscale: The scale parameter 0.` is expected to be
> positive.
>
> It seems like I should get a random number with mean 10 and sigma 0. Or
> in other words, the result should 10 every time.
>
> In my program I want an array of number taken from different
> distributions
> Map[Random,Thread[NormalDistribution[Array1,Array2]]]
>
> And elements of Array2 may be 0 for which I woudl ike the corresponding
> value in Array1 returned. In fact,
> Random[NormalDistribution[10.0,0.000000001]]
> does return 10.0 as expected.
>
> This worked in 5.1, but now returns this error in 5.1.1.
>
> Anyone have an easy workaround?
>
> Thanks,
> Ben Barrowes
>
>
>
>



-- 
DrBob at bigfoot.com


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